Allen-Bradley 1756-IF8

Technical specifications

Manufacturer

Allen-Bradley

Manufacturer part no.

1756-IF8

Type

Analog input module

Application

I/O module

Used with

ControlLogix 1756 chassis

Inputs

Eight single-ended, Four differential, Two high-speed differential

Input range

±10V 0…10V 0…5V 0…20 mA

Resolution

±10.25V: 320 µV/count (15 bits plus sign bipolar) 0…10.25V: 160 µV/count (16 bits) 0…5.125V: 80 µ/V count (16 bits) 0…20.5mA: 0.32 µA/count (16 bits)

Current draw @ 5.1V

200 mA

Current draw @ 24V

30 mA

Total backplane power

1.74 W

Voltage and current ratings

Backplane: 5.1V DC, 200 mA max, 24V DC, 30 mA max, Input voltage range: -10…+10V, Input current range: 0…20mA, Limited to 100VA

Power consumption

1.73 W

Power dissipation

Voltage: 1.74 W, Current 2.58 W

Thermal dissipation

Voltage: 5.94 BTU/hr, Current: 8.79 BTU/hr

Open circuit detection time

Differential current or differential voltage: Positive full-scale reading within 5 s, Single-ended current or single-ended voltage: Even-numbered channels go to positive full scale reading within 5 s, odd-numbered channels go to negative full scale reading within 5 s

Overvoltage protection, max

Voltage: 30V DC, Current: 8V DC

Normal mode noise rejection

>80 dB @ 50/60 Hz

Common mode noise rejection

>100 dB @ 50/60 Hz

Calibrated accuracy 25 °C (77 °F)

Voltage: Better than 0.05% of range, Current: Better than 0.15% of range

Offset drift

45 µV/°C

Gain drift with temperature

Voltage: 15 ppm/°C, Current: 20 ppm/°C

Module error

Voltage: 0.1% of range, Current: 0.3% of range

Module input scan time, min

8 pt single-ended (floating point): 16…488 ms 4 pt differential (floating point): 8…244 ms 2 pt differential (floating point): 5…122 m

Onboard data alarming

Yes

Data format

Integer mode (left justified, 2 s complement) IEEE 32-bit floating point

Module conversion method

Sigma-Delta

Isolation voltage

250V (continuous), Basic insulation type, Inputs to Backplane., No isolation between individual Inputs.

Module keying

Electronic, software configurable

RTB keying

User-defined mechanical

Technical documents (1)

• Rockwell Automation technical data 1756-TD002

Key features

• Eight single-ended, four differential or two high-speed differential inputs
• Input ranges of ±10V, 0…10V, 0…5V and 0…20 mA
• Integer or IEEE 32-bit floating point data format
• Onboard data alarming and software configurable electronic keying
• 250V continuous basic isolation from inputs to backplane

About the Allen-Bradley 1756-IF8

The 1756-IF8 is a ControlLogix 8 point analog input module. It takes eight single-ended, four differential or two high-speed differential inputs, with ranges of ±10V, 0…10V, 0…5V and 0…20 mA. Calibrated accuracy at 25 °C is better than 0.05% of range for voltage and 0.15% of range for current, using Sigma-Delta conversion. It draws 200 mA at 5.1V and 30 mA at 24V from the backplane.

What is the 1756-IF8 used for?

It reads analog voltage or current signals into a ControlLogix system and presents them as integer or IEEE 32-bit floating point data. It takes one slot, offers onboard data alarming and works from 0 °C to +60 °C. Inputs are isolated from the backplane at 250V continuous, basic insulation, with no isolation between individual inputs.

Lifecycle and successor

Active (Rockwell Automation lifecycle status, checked 24 October 2026).

Before you order

What to photograph or confirm so the right unit is quoted.

Read the catalog number 1756-IF8, the series letter and the firmware revision from the label. Send us a photo of the label and we confirm the match before we quote.